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Methane Steam Reforming for Producing Hydrogen in an Atmospheric-pressure Microwave Plasma Reactor by Ya-Fen Wang; Cheng-Hsien Tsai; Wan-Yu Chang; Yi-Ming Kuo is a Engineering article available to read on EtoBox.

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A methane steam reforming process for producing mainly hydrogen in an atmosphericpressure microwave plasma reactor is demonstrated. Nano carbon powders, CO x , C 2 H 2 , C 2 H 4 , and HCN were also formed. Intermediates such as OH, NH, CH, and active N 2 were identified using optical emission spectroscopy. The selectivity of H 2 was greater than 92.7% at inlet H 2 O/CH 4 molar ratio (R) S 0.5, and was higher than that obtained using methane plasmalysis because steam inhibited the formation of C 2 H 2 . The highest methane conversion was obtained at R 1⁄4 1, reaching 91.6%, with the lowest specific energy consumption of H 2 formation at [CH 4 ] in 1⁄4 5%, 1.0 kW, and 12 slpm. The plasma-assisted catalysis process, which packed Ni/Al 2 O 3 catalysts in the discharge zone and supplied heat using hot effluents, was used to elevate the methane conversion and hydrogen selectivity. However, large amounts of 40-70 nm carbon powder, which is electrically conductive, were produced, resulting in rapid catalyst deactivation due to carbon being deposited on the surface and in the pores of catalysts.

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Author

Ya-Fen Wang; Cheng-Hsien Tsai; Wan-Yu Chang; Yi-Ming Kuo

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0360-3199)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)